339 
head). The fourth row has six hairs which I name the submedian, 
the intermediate and the sublateral pairs; two hairs inserted on or 
very near the lateral margin close behind the eye have not been 
included for the reasons mentioned as to the lateral hair outside 
the second row. While the number of the hairs on the upper sur- 
face of the head is absolutely identical in all species of the family, 
the hairs vary much in shape and relative length from species to 
species, and they present good specific characters. 
The first tergum of the trunk has eight hairs arranged in 
two transverse rows; besides a hair is situated in front of the ter- 
gum close behind the head and near the lateral margin. The se- 
cond, third and fourth terga each with eight hairs arranged in two 
transverse rows and besides on each half two hairs inserted outside 
the others; on the second tergum these lateral hairs are placed 
respectively in front of and behind the base of the first tactile 
seta and both near to it (comp. Brachypauropus); on the third and 
fourth terga the posterior one of the two lateral hairs is sometimes 
more distant from the tactile seta. The fifth tergum has in Stylo- 
Ppauropus eight hairs or setæ in two rows and two pairs of lateral 
setæ; in Pauropus the posterior of the two hairs is wanting. The 
sixth tergum has always six setæ (comp. Brachypauropus which 
"has four setæ on the tergum and a lateral pair on the membrane). 
— The three pairs of setæ on the tergum of the anal segment 
are never clavate. 
The essential structure of the legs has been described above. 
Å short metatarsus is not found in the first and the ninth, but 
in all the other pairs. The hairs on the coxa and trochanter are 
simple (not biramous) in the anterior eight pairs of legs and in 
few species in all pairs; in most species these hairs are biramous 
in the minth pair. The hairs are subcylindrical or clavate, often 
Pubescent; a biramous hair (pl. II, fig. 2 e) looks as two hairs 
Originating from a short, simple peduncle, which never is thickened ; 
the two branches are always rather similar in shape and slightly 
Pr æg 
